- Author: Thomas Turini
- Author: Nicholas E Clark
Between 22 and 27 Feb, Ascochyta blight in garbanzo beans was detected in the Five Points/Lemoore area.
This disease has potential to cause economic damage, is favored by wet conditions and moderate temperatures, and rain is in the forecast for Friday, March 1st and Sunday, March 3rd.
Fungicides, such as Endura (boscalid), Headline (pyraclostrobin), or Quadris (azoxystrobin) applied to garbanzo foliage preventatively will reduce risk of loss due to this disease.
Consult product labels carefully before applying a fungicide treatment to ensure the most effective application method, timing and rate.
Here are recent resources for more information about Ascochyta blight in garbanzos:
https://ucanr.edu/blogs/blogcore/postdetail.cfm?postnum=26328
https://ipm.ucanr.edu/agriculture/dry-beans/ascochyta-blight-garbanzo-beans/
Below are photos by Tom Turini showing typical signs and symptoms of Ascochyta blight of garbanzo on plant samples recently collected in the Five Points/Lemoore area.
Circular lesions with dark centers and foliar dieback on garbanzo bean plant.
Garbanzo bean leaves with necrosis and small dark ifungal structures (pycnidia) of Ascochyta rabiei.
Garbanzo bean plant with stem lesion and substantial dieback.
- Author: Michelle Leinfelder-Miles
- Contributor: Giuliano Galdi
The trial was planted in a field of CB46, and fertility and pests were managed by the grower in the same manner as the field. Data are presented in Table 1. Stand counts were made approximately two weeks after planting on July 20th. The stand was assessed as the number of plants per two-foot length. Twelve replicate counts were averaged. We evaluated aphid and lygus damage on September 8th, which were low due to the grower's management. For lygus, we took 10 sweeps from four locations in each plot and counted the lygus. Data were averaged and are presented as a 10-sweep count. For aphids, we used a rating scale from 0 to 10 that accounted for visible crown damage and aphid incidence. In addition to the in-field assessment of lygus, we also evaluated harvest samples for stings and found that, on average, about 1.2 percent of the beans had lygus damage. No diseases were observed.
We harvested on November 6th. All six rows of each variety were cut and raked into one windrow. At the time of cutting, the grower observed that CB77 plants were laying flat, but they were laying in such a way that the knives still picked up the plants. The grower also observed that CB74 had an upright growth habit that could potentially make it a variety viable for swather cutting. We evaluated 100-seed weight as a measure of seed size, evaluating five 100-seed samples per variety.
We would like to thank the cooperating grower, the CA Crop Improvement Association for funding regional trials, and the CA Dry Bean Advisory Board for assistance with statewide research prioritization and assistance with outreach.
Table 1. 2023 Blackeye Bean Variety Evaluation Results